Hi, no doubt, the color can definitely be altered, and there are many ways to do this.
I tend to use the following two methods:
1. Use the image editing tool to modify the color of the diffuse maps in the Runtime directory.
2. Adjust the color of the rendering result in the image editing tool or the post-production software.
In addition, there are some other ways such as adjusting the material settings of womb&vagina node or even adjusting the lights can also help you achieve the results you want.
Through the X-Ray Machine's control panel, the vagina can only accommodate column-like objects.
If you want to use objects of other shapes, you can use the control panel to make a rough adjustment first. Then select the womb&vagina node in the Scene pane and then find the 'Hidden' group in the Parameters pane. Finally, manually adjust the morphs called 'Womb-Horizontal Movement-xx'(xx ranges from 01 to 25).
I hope my answers can help you.
3feetwolf attached the following image(s):